Extended Data Fig. 6: Data evaluation of F(z) curves.
From: Direct assessment of the acidity of individual surface hydroxyls
a, Frequency-shift curves acquired on different OH groups and the In2O3(111) background measured in-between the OH groups (mostly in regions A and C, see Fig. 1). b, The averaged curves from a (solid lines) and after background subtraction (dashed lines). c, Background-corrected F(z) curves obtained from b using Sader’s formula33 (fR = 77.7 kHz, k = 5,400 N m−1, A = 100 pm). d, The F(z) curves of Fig. 2a showing the whole z range.
